Bolt-lock.



No. 702,254. Patented :une lo, |902.

H. A. STDCKMAN.

BOLT LOCK.

Application led July 16, 1901.)

(No Model.)

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f NTTED STATES p-PATENT Ormes.

HARRY/ A. STOCKMAN, OF JOI'IANNESBURG, SOUTI-I AFRICAN REPUBLIC.

BOLT-LOCK.

SPECIFICATIGN forming part of Letters Patent No. 702,254, dated J' une10, 1902.

Application led July 16,1901. Serial No.`68,484. (No model.)

To all whom, it may con/cern;

Be it known that I, HARRY A. STOCKMAN, a subject of the King of Swedenand Norway, residing at Johannesburg, South African Republic, have madecertain new and useful Improvements in Bolt-Locks, of which thefollowing is a specification.

My invention is an improvement in boltlocks, which while it is designedespecially for use in mine-shafts for securing the upright guides to thecross-timbers will be found useful in other locations wherever it isdesired to bolt timbers together which are subjected to vibration whichtend to loosen them, as in bridges and like structures; and theinvention consists in certain novel constructions and combinations ofparts, as will be hereinafter described and claimed.

In the drawings, Figure l is a vertical longitudinal section of myholder as in use. Fig. 2 is a longitudinal section of the holder. Fig. 3is a perspective view thereof, and Fig. e is a cross-section of theholder on about line 4 4 of Fig. 2.

In mines where it is desired simply to secure the guides or runners andthe cross-timbers, such as A and B, together difficulty iseX` myinvention I seek to provide means where-v by the bolts will be held fromjarringloosaand yet can be readily removed whenever desired. To this endI provide a holder such as shown in the drawings, and which ispreferably made of brass or other metal which will not readily oxidizeand is so formed as to be compressed when seated in its supporting-beamso it will bind upon the bolts and prevent the same from turning.

As shown and preferred, the holder is in the form of a tubular bodyformed with end rings C and between the same with longitudinaldiametrically opposite slots C', which are enlarged circumferentially attheir opposite ends, forming narrow necks C2 at the ends of the barsformed by the said slots, which necks separate the end openings C3 ofthe opposite slots. The walls of the slots flare outwardly at C, andthebars D, produced by the slots C', are threaded internally throughouttheir lengths between the end openings C3, while the necks G2`and therings() at the ends of the body are unthreaded. ,The bars D are providedon their outer sides at their centers with the longitudinally-extendingribs D', which preferably taper slightly toward their opposite ends tofacilitate the introduction of the holder into a beam.

In practice the holders are made with the threaded bore ofthe bars Dformed to fit the bolts E which are to be used, and the hole A in Jthebeam A to receive the holder is made slightly smaller than such holder,so the latter when it is driven into the hole A will be so compressed asto reduce the diameter of its threaded bore to such an extent as tocause the holder to firmly grip the bolts when they are turned home, asshown in Fig. 1, and so prevent the same from accidentally jarringloose.A When the holder is driven into the hole Athe ribs D' willoperate to prevent the same from turning, and such ribs by theirtapering or sloped formation at their ends will aid in compressing thebars D, as

desired. It will also be noticed that this compression of the holderwill be facilitated by the narrow necks produced at the ends of the barsD by enlarging the ends of the slots C', as before described.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. The bolt-holder herein described consisting of a tubular body havingend rings and longitudinal slots on diametrically opposite linesextending between the said rings.

and provided at their ends with enlarged portions producing narrow necksat the ends of the bars formed by said slots and between the same andthe end rings and having such bars threaded internally and the end ringsunthreaded, the bars being provided with the longitudinaloutwardlyprojecting ribs all substantially as and for the purposes setforth.

IOO

threaded internally and the necks and rings being unthreadedsubstantially as set forth.

5. The bolt-holder herein described consisting of 'the tubular bodyhaving the end rings, and the longitudinal slots forming the bars andenlarged at their ends producing the narrow necks connecting said ringsand bars, the bars being threaded internally substantially as set forth.

HARRY A. STOCKMAN.

Witnesses:

JOHN FARMAGE, JAS.- D. RANDALL.

